Plansifter



E. ROTH AND J. STEINER PLANSIFTER.

APPLICATION FILED APR. 16. 1920. 1,359,840.

Patented Nov. 23, 192%.

2 SHEETS-SHEET l.

E. ROTH AND J. STEINER.

PLANSIFTER. 7

APPLICATION FILED APR. 16. 1920.

1,35%,40; PatentedNov. 23,1920.

2 SHEETS-SHEET 2.

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srrasfea'r ERNST ROTH, or irrnnn wzwrn, AND JAKOB seamen, or WIL, sr. GA LEN, swITzEa' Lani), assienoas TO THE FIRM Bunions BROTHERS, or UZWIL, 's'w'I'rzE L-AND.

PLANSIFTER. v

v Be it known that we, ERNST ROTH, a oitizen of the Republic of Switzerland, residing at 'Niederuzwil, Switzerland, and Janos Bremen, a citizen of the Republic of Switzerland, residing at Will, St. Gallen, Switz erland, have invented new andfuseiul' 1mproveinents in Plansifters; and wedo hereby declare the following-to be a clear, full,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to tho accompanying drawings, and to letters or figures of reference vmarked thereon, which form a v the ob ect of the nvention 1n ave'rt1calsec'-;

part of this specification.

Specification of Letters Patent.

p Patented No 23, 1920., 1920. Serial no. 3%,407;

. mission of the turning moment, Whioh'car- This invention relates to improvements in a so-called freely oscillating plansifter of the type in which the sieve box and the balancin wei ht thereof causin the rotar V b c movement are each suspended separately,

orain which the sieve box is supported man appropriate manner and only the balancing weight is suspended and in which furthermore, in a known manner, the position of the balancing weight does notchange appreciably in relation to the center of gravity work'or; when it is at rest. In known constructions of this types-of plansii ter's. the pendulum shaft on which the balancing weight is suspended is connected in an are ticulated manner to the latter approxianately in thevertical gravity axis 5f the baiancing weight. Such an arrangement is the object of the Tatent No. 1210989dated 2nd January 1917.;

Such arrangements have presented the draw-back that the wear and tear at the balancing weight which insures the trans 'ofthe sieve boxeither when the sitter is at ries the balancin wei' 'ht and owin to the g g e,

oe -ICE- flexibility of the connectingmembers allows or" adjusting of the various parts underi all working conditions; Y

The accompanylng drawings illustrate by way of example several modes of carrying the invention :into effect,

mgs: .7

Flgure lglsa front VlBW' 01 a planslfter In these drawin which the connection according to the invention between the pendulum shaft and,

the balancing weight is shownin section-.7 V

'- Flg. 2 isap'lan of Flg. l. v

Flg. 3 shows a modified arrangement of of the sieve box and approximatelyhalf the height-thereohthe gudgeon l entering into a bore ofthe balan cing weight 1. In the 8 exemplification shown the flexible connec-o tion between the pendulum shaft and the balancing weight consists of an articulated I joint and a. spring'connection To the arm 'Tfiized to thefiower end ofthesep'arately suspended pendulum shaft Q'the baIancing weight issuspen'ded in such away that it can adjust itself during its turninginoveinent. To thisend the'balanoing weight, i rests bymeans of ahardened steel, point 8, secured to the'weight, in a suitably arranged seat 9 of the arm 7. Several such" seats may be arrangedion arm 7, two seats are showny in Fig; 1. "Furthermorea U-shaped plate? spring 10 is provided, the oneend of which is fixedto the arm 7 of the pendulum shaft 2 and the other end is secured to'the balancing weight 1. This spring serves to trans- 1 mit the rotary movement; of the. driving shaft 2 to the balancing weightl and it does not hinder in any way the movement of the sitter Therrbalancing weighti does ,not change its posit on appreciably 1n relatlon to the center of gravity-of the sieve box 5" when working, as the balanoingweight is arranged suchwlse 1n relatlon to the driving gudgeon 4, that thecentrlfugal forces produced when it isat work cannot cause it to alter appreciably its position in relation to the center of gravity of the sieve box. The

, or sleeve 13 is provided to that end.

pended balancing weight 1 is a negligible quantity and any wear of the chilled point S Vis nearly excluded. Furthermore 'when the sifter isworking under abnormal con ditions a tension is produced in the spring 10 resulting from the variation of the relative positions of pendulum shaft 2 and balancing weight 1, which tension tends to bring the sifter 5 back into its normal position. 7 v

In the exemplification of the invention shown in Fig. 3 the flexible connection between pendulum shaft and balancing weight consists of a U-shaped spring 10, the one shank of which is lengthened and secured to the balancing weight at 1'1, and fixed to the arm 7 on the fulcrum shaft 2 at 12. The transmission of the driving moment from pendulum shaft to balancing weight, and the suspension of the weight is'efl'ected by this spring 10 which moreover allows a variation of the relative positions of the pendulum shaft 2 and balancing weight 1 and counteracts that variation in a resilient manner. r

In the modification illustrated in Fig. 4: in place of the U-shaped spring 10 of the exemplification shown in *Fig. 3, a plate spring 10 isused theends of which are connected at 12 to an arm 7 secured to the lower end of the pendulumshaftQ and atll to the balancing weight. The functions of this plate spring are the same as that described above for the U-shaped spring. i The constructional example shown in Fig. 5 differs from that shown in Fig. 4 inasmuch as for the purpose of attaining a greater flexibility in the connection between pendulum shaft-andbalancing weight, the latter is not adapted to take up the driving pin as in the above mentioned exemplifications ofv the invention, but a separate part The connection of part 13 to the'balancing weight is effected by eyes and a horizontally arranged pin ll around which the weight may swin when its position relatively to sleeve 13 is altered. g

All the exemplifications shown and de scribed hereinbefore are based on the same principle of providing a flexible connection between pendulum shaft and balancing weight to which the aforementioned advantages are inherent.

We claim:

1. 'Ina freely oscillating plansifter, the

combination of a sieve box, a pendulum member, a balancing weight, and a flexibleconnection between pendulum member and balancing weight, which connection transmits. the rotary movement from the pendulum member to the balancing weight, by which connection the latter is suspended and which allows of an adjustment of the movingparts. under all working conditions.

2. ln a freely oscillating plansifter, the combination of a sieve box, a pendulum member, a balancing weight, and a flexible connection between pendulum member and balancing weight consisting of aresilient member connected to the pendulum member and to the balancing weight and of a suspension device for suspending the balancing weight to the pendulum member which parts of said connection allow of an adjustment of the moving parts under all working con-i ditions. 7

3. in a freely oscillating plansifter, the combination of a sieve box, a pendulum member, abalancingweight, and a flexible connection between pendulum member and balancing weight consisting of a U-shaped spring the shorter shank of which is secured to the balancing weight and the longer shank which is fixed to the balancing weight and to the pendulunr member and which spring serves to transmit the rotary mov ment of the pendulum member to the balancing weight, further to carry the'latter v and to allow of an adjustment of the moving parts under all working conditions.

l. In a freely oscillating 'plansifter, the. combination of a sieve box, a pendulum member, a balancing weight, and a flexible. connection between pendulum member: and balancing weightoonsisting of a spring mem-; her one end of which is secured to the pen. dulum member and the other end to the balancing weight. V

In a freely oscillating plansifter, the combination of a sieve box, a pendulum member, a balancing weight, and a flexible connection between pendulum member and balancing weight, consisting of a platev spring the ends of which are secured. to the pendulum member and the balancing weight 7 respectively and of an articulatedjoint between the balancing weight and its fulcrum.

In testimony that we claim the foregoing as our invention, we have signed our names.

ERNST ROTH.

JAKOB STEINER.

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